Post tripPlanEmpty when a plan yields no itinerary - #165
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Hosts embedding the planner had no way to learn that a request came back with nothing usable: itinerariesUpdated fires only on success, and a server error such as PATH_NOT_FOUND only shows an alert. Post a new notification in both cases, with the reason and the planned origin and destination in userInfo, so a host can offer alternatives such as on-demand services between those points.
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe trip planner now posts an empty-plan notification for error responses and successful responses without itineraries. The notification includes the reason and the request’s endpoint coordinates. The planner cancels previous requests and ignores canceled results. ChangesTrip plan empty notifications
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change adds a public notification for plans that return an error or no itineraries. It includes the request's endpoints and suppresses notifications from superseded or reset requests. No merge-blocking risk is evident. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Request-bound coordinates and cancellation checks improve stale-response handling. However, a synchronous reset during an existing notification can still be followed by an obsolete empty-plan notification. The demonstrated scope is app-local; downstream fallback handling was not available to assess. Retained concerns
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Inline comments:
In @OTPKit/Sources/OTPKit/Presentation/ViewModel/TripPlannerViewModel.swift:
- Line 298: In the response-handling flow in TripPlannerViewModel, determine
whether response.plan?.itineraries is empty before posting itinerariesUpdated,
then use that captured result to decide whether to post tripPlanEmpty.
In
@OTPKit/Sources/OTPKit/Presentation/ViewModel/TripPlannerViewModel+EmptyPlan.swift:
- Line 17: Update the postTripPlanEmpty call and helper to use the origin and
destination captured by the completed fetchPlan request, rather than the current
selected endpoints; use those request coordinates for both endpoint key pairs so
the notification matches the plan result.
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OTPKit/Sources/OTPKit/Core/Notifications.swiftOTPKit/Sources/OTPKit/Presentation/ViewModel/TripPlannerViewModel+EmptyPlan.swiftOTPKit/Sources/OTPKit/Presentation/ViewModel/TripPlannerViewModel.swiftOTPKit/Tests/TripPlannerViewModelTests.swift
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Code reviewNo issues found. Checked for bugs and CLAUDE.md compliance. 🤖 Generated with Claude Code |
- tripPlanEmpty now carries the coordinates of the request that produced the result, not the current selection, which may have changed in flight. - Classify the response as empty before posting itinerariesUpdated so an observer cannot change the outcome. - Cancel an in-flight plan when a new one starts or the planner resets, so a stale response neither overwrites state nor notifies the host. - Expose the reason values as tripPlanEmptyReasonError / ...Empty. Co-Authored-By: Claude <noreply@anthropic.com>
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Summary
TripPlannerViewModel.handlePlanResponsenow posts a new public notification,Notifications.tripPlanEmpty, whenever a plan response carries an error (userInfo["reason"] == "error") or zero itineraries ("empty").itinerariesUpdatedis still posted only on success, so hosts had no way to detect "no trips found".tripPlanEmptyOriginLatitudeKey/...OriginLongitudeKey/...DestinationLatitudeKey/...DestinationLongitudeKeyso a host can react without re-reading the view model.TripPlannerViewModel+EmptyPlan.swiftextension to stay within the SwiftLint type and file length limits.OneBusAway iOS uses this for the GTFS-Flex "On-demand options" fallback: when fixed-route planning finds nothing, the app probes both endpoints for on-demand zones and offers a call-to-book card. The iOS branch currently pins this branch of OTPKit and will switch back to
mainonce this merges.Test plan
TripPlannerViewModelTests: four new tests cover the error case, the empty case, the success case not posting, and the endpoint keys; 43 tests pass.swiftlint lint --strictclean.Review notes
iPhone 17 Prosimulator with no OS; on a machine with several iOS runtimes xcodebuild reports an ambiguous destination and the hook fails. The push for this branch was made withSKIP=xcode-testsafter running the suite manually. Pinning the hook's destination (an OS version or a device id) would fix it; that belongs in a separate PR.Summary by CodeRabbit